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   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <ilw@linux.intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28
  29 #ifndef __iwl_io_h__
  30 #define __iwl_io_h__
  31
  32 #include <linux/io.h>
  33
  34 #include "iwl-debug.h"
  35 #include "iwl-devtrace.h"
  36
  37 /*
  38  * IO, register, and NIC memory access functions
  39  *
  40  * NOTE on naming convention and macro usage for these
  41  *
  42  * A single _ prefix before a an access function means that no state
  43  * check or debug information is printed when that function is called.
  44  *
  45  * A double __ prefix before an access function means that state is checked
  46  * and the current line number and caller function name are printed in addition
  47  * to any other debug output.
  48  *
  49  * The non-prefixed name is the #define that maps the caller into a
  50  * #define that provides the caller's name and __LINE__ to the double
  51  * prefix version.
  52  *
  53  * If you wish to call the function without any debug or state checking,
  54  * you should use the single _ prefix version (as is used by dependent IO
  55  * routines, for example _iwl_read_direct32 calls the non-check version of
  56  * _iwl_read32.)
  57  *
  58  * These declarations are *extremely* useful in quickly isolating code deltas
  59  * which result in misconfiguration of the hardware I/O.  In combination with
  60  * git-bisect and the IO debug level you can quickly determine the specific
  61  * commit which breaks the IO sequence to the hardware.
  62  *
  63  */
  64
  65 static inline void _iwl_write32(struct iwl_priv *priv, u32 ofs, u32 val)
  66 {
  67         trace_iwlwifi_dev_iowrite32(priv, ofs, val);
  68         iowrite32(val, priv->hw_base + ofs);
  69 }
  70
  71 #ifdef CONFIG_IWLWIFI_DEBUG
  72 static inline void __iwl_write32(const char *f, u32 l, struct iwl_priv *priv,
  73                                  u32 ofs, u32 val)
  74 {
  75         IWL_DEBUG_IO(priv, "write32(0x%08X, 0x%08X) - %s %d\n", ofs, val, f, l);
  76         _iwl_write32(priv, ofs, val);
  77 }
  78 #define iwl_write32(priv, ofs, val) \
  79         __iwl_write32(__FILE__, __LINE__, priv, ofs, val)
  80 #else
  81 #define iwl_write32(priv, ofs, val) _iwl_write32(priv, ofs, val)
  82 #endif
  83
  84 static inline u32 _iwl_read32(struct iwl_priv *priv, u32 ofs)
  85 {
  86         u32 val = ioread32(priv->hw_base + ofs);
  87         trace_iwlwifi_dev_ioread32(priv, ofs, val);
  88         return val;
  89 }
  90
  91 #ifdef CONFIG_IWLWIFI_DEBUG
  92 static inline u32 __iwl_read32(char *f, u32 l, struct iwl_priv *priv, u32 ofs)
  93 {
  94         IWL_DEBUG_IO(priv, "read_direct32(0x%08X) - %s %d\n", ofs, f, l);
  95         return _iwl_read32(priv, ofs);
  96 }
  97 #define iwl_read32(priv, ofs) __iwl_read32(__FILE__, __LINE__, priv, ofs)
  98 #else
  99 #define iwl_read32(p, o) _iwl_read32(p, o)
 100 #endif
 101
 102 #define IWL_POLL_INTERVAL 10    /* microseconds */
 103 static inline int _iwl_poll_bit(struct iwl_priv *priv, u32 addr,
 104                                 u32 bits, u32 mask, int timeout)
 105 {
 106         int t = 0;
 107
 108         do {
 109                 if ((_iwl_read32(priv, addr) & mask) == (bits & mask))
 110                         return t;
 111                 udelay(IWL_POLL_INTERVAL);
 112                 t += IWL_POLL_INTERVAL;
 113         } while (t < timeout);
 114
 115         return -ETIMEDOUT;
 116 }
 117 #ifdef CONFIG_IWLWIFI_DEBUG
 118 static inline int __iwl_poll_bit(const char *f, u32 l,
 119                                  struct iwl_priv *priv, u32 addr,
 120                                  u32 bits, u32 mask, int timeout)
 121 {
 122         int ret = _iwl_poll_bit(priv, addr, bits, mask, timeout);
 123         IWL_DEBUG_IO(priv, "poll_bit(0x%08X, 0x%08X, 0x%08X) - %s- %s %d\n",
 124                      addr, bits, mask,
 125                      unlikely(ret  == -ETIMEDOUT) ? "timeout" : "", f, l);
 126         return ret;
 127 }
 128 #define iwl_poll_bit(priv, addr, bits, mask, timeout) \
 129         __iwl_poll_bit(__FILE__, __LINE__, priv, addr, bits, mask, timeout)
 130 #else
 131 #define iwl_poll_bit(p, a, b, m, t) _iwl_poll_bit(p, a, b, m, t)
 132 #endif
 133
 134 static inline void _iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
 135 {
 136         _iwl_write32(priv, reg, _iwl_read32(priv, reg) | mask);
 137 }
 138 #ifdef CONFIG_IWLWIFI_DEBUG
 139 static inline void __iwl_set_bit(const char *f, u32 l,
 140                                  struct iwl_priv *priv, u32 reg, u32 mask)
 141 {
 142         u32 val = _iwl_read32(priv, reg) | mask;
 143         IWL_DEBUG_IO(priv, "set_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
 144         _iwl_write32(priv, reg, val);
 145 }
 146 static inline void iwl_set_bit(struct iwl_priv *p, u32 r, u32 m)
 147 {
 148         unsigned long reg_flags;
 149
 150         spin_lock_irqsave(&p->reg_lock, reg_flags);
 151         __iwl_set_bit(__FILE__, __LINE__, p, r, m);
 152         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 153 }
 154 #else
 155 static inline void iwl_set_bit(struct iwl_priv *p, u32 r, u32 m)
 156 {
 157         unsigned long reg_flags;
 158
 159         spin_lock_irqsave(&p->reg_lock, reg_flags);
 160         _iwl_set_bit(p, r, m);
 161         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 162 }
 163 #endif
 164
 165 static inline void _iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
 166 {
 167         _iwl_write32(priv, reg, _iwl_read32(priv, reg) & ~mask);
 168 }
 169 #ifdef CONFIG_IWLWIFI_DEBUG
 170 static inline void __iwl_clear_bit(const char *f, u32 l,
 171                                    struct iwl_priv *priv, u32 reg, u32 mask)
 172 {
 173         u32 val = _iwl_read32(priv, reg) & ~mask;
 174         IWL_DEBUG_IO(priv, "clear_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
 175         _iwl_write32(priv, reg, val);
 176 }
 177 static inline void iwl_clear_bit(struct iwl_priv *p, u32 r, u32 m)
 178 {
 179         unsigned long reg_flags;
 180
 181         spin_lock_irqsave(&p->reg_lock, reg_flags);
 182         __iwl_clear_bit(__FILE__, __LINE__, p, r, m);
 183         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 184 }
 185 #else
 186 static inline void iwl_clear_bit(struct iwl_priv *p, u32 r, u32 m)
 187 {
 188         unsigned long reg_flags;
 189
 190         spin_lock_irqsave(&p->reg_lock, reg_flags);
 191         _iwl_clear_bit(p, r, m);
 192         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 193 }
 194 #endif
 195
 196 static inline int _iwl_grab_nic_access(struct iwl_priv *priv)
 197 {
 198         int ret;
 199         u32 val;
 200
 201         /* this bit wakes up the NIC */
 202         _iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 203         ret = _iwl_poll_bit(priv, CSR_GP_CNTRL,
 204                            CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 205                            (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 206                             CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 207         if (ret < 0) {
 208                 val = _iwl_read32(priv, CSR_GP_CNTRL);
 209                 IWL_ERR(priv, "MAC is in deep sleep!.  CSR_GP_CNTRL = 0x%08X\n", val);
 210                 _iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
 211                 return -EIO;
 212         }
 213
 214         return 0;
 215 }
 216
 217 #ifdef CONFIG_IWLWIFI_DEBUG
 218 static inline int __iwl_grab_nic_access(const char *f, u32 l,
 219                                                struct iwl_priv *priv)
 220 {
 221         IWL_DEBUG_IO(priv, "grabbing nic access - %s %d\n", f, l);
 222         return _iwl_grab_nic_access(priv);
 223 }
 224 #define iwl_grab_nic_access(priv) \
 225         __iwl_grab_nic_access(__FILE__, __LINE__, priv)
 226 #else
 227 #define iwl_grab_nic_access(priv) \
 228         _iwl_grab_nic_access(priv)
 229 #endif
 230
 231 static inline void _iwl_release_nic_access(struct iwl_priv *priv)
 232 {
 233         _iwl_clear_bit(priv, CSR_GP_CNTRL,
 234                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 235 }
 236 #ifdef CONFIG_IWLWIFI_DEBUG
 237 static inline void __iwl_release_nic_access(const char *f, u32 l,
 238                                             struct iwl_priv *priv)
 239 {
 240
 241         IWL_DEBUG_IO(priv, "releasing nic access - %s %d\n", f, l);
 242         _iwl_release_nic_access(priv);
 243 }
 244 #define iwl_release_nic_access(priv) \
 245         __iwl_release_nic_access(__FILE__, __LINE__, priv)
 246 #else
 247 #define iwl_release_nic_access(priv) \
 248         _iwl_release_nic_access(priv)
 249 #endif
 250
 251 static inline u32 _iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 252 {
 253         return _iwl_read32(priv, reg);
 254 }
 255 #ifdef CONFIG_IWLWIFI_DEBUG
 256 static inline u32 __iwl_read_direct32(const char *f, u32 l,
 257                                         struct iwl_priv *priv, u32 reg)
 258 {
 259         u32 value = _iwl_read_direct32(priv, reg);
 260         IWL_DEBUG_IO(priv, "read_direct32(0x%4X) = 0x%08x - %s %d \n", reg, value,
 261                      f, l);
 262         return value;
 263 }
 264 static inline u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 265 {
 266         u32 value;
 267         unsigned long reg_flags;
 268
 269         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 270         iwl_grab_nic_access(priv);
 271         value = __iwl_read_direct32(__FILE__, __LINE__, priv, reg);
 272         iwl_release_nic_access(priv);
 273         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 274         return value;
 275 }
 276
 277 #else
 278 static inline u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 279 {
 280         u32 value;
 281         unsigned long reg_flags;
 282
 283         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 284         iwl_grab_nic_access(priv);
 285         value = _iwl_read_direct32(priv, reg);
 286         iwl_release_nic_access(priv);
 287         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 288         return value;
 289
 290 }
 291 #endif
 292
 293 static inline void _iwl_write_direct32(struct iwl_priv *priv,
 294                                          u32 reg, u32 value)
 295 {
 296         _iwl_write32(priv, reg, value);
 297 }
 298 static inline void iwl_write_direct32(struct iwl_priv *priv, u32 reg, u32 value)
 299 {
 300         unsigned long reg_flags;
 301
 302         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 303         if (!iwl_grab_nic_access(priv)) {
 304                 _iwl_write_direct32(priv, reg, value);
 305                 iwl_release_nic_access(priv);
 306         }
 307         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 308 }
 309
 310 static inline void iwl_write_reg_buf(struct iwl_priv *priv,
 311                                                u32 reg, u32 len, u32 *values)
 312 {
 313         u32 count = sizeof(u32);
 314
 315         if ((priv != NULL) && (values != NULL)) {
 316                 for (; 0 < len; len -= count, reg += count, values++)
 317                         iwl_write_direct32(priv, reg, *values);
 318         }
 319 }
 320
 321 static inline int _iwl_poll_direct_bit(struct iwl_priv *priv, u32 addr,
 322                                        u32 mask, int timeout)
 323 {
 324         int t = 0;
 325
 326         do {
 327                 if ((iwl_read_direct32(priv, addr) & mask) == mask)
 328                         return t;
 329                 udelay(IWL_POLL_INTERVAL);
 330                 t += IWL_POLL_INTERVAL;
 331         } while (t < timeout);
 332
 333         return -ETIMEDOUT;
 334 }
 335
 336 #ifdef CONFIG_IWLWIFI_DEBUG
 337 static inline int __iwl_poll_direct_bit(const char *f, u32 l,
 338                                             struct iwl_priv *priv,
 339                                             u32 addr, u32 mask, int timeout)
 340 {
 341         int ret  = _iwl_poll_direct_bit(priv, addr, mask, timeout);
 342
 343         if (unlikely(ret == -ETIMEDOUT))
 344                 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) - "
 345                              "timedout - %s %d\n", addr, mask, f, l);
 346         else
 347                 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) = 0x%08X "
 348                              "- %s %d\n", addr, mask, ret, f, l);
 349         return ret;
 350 }
 351 #define iwl_poll_direct_bit(priv, addr, mask, timeout) \
 352         __iwl_poll_direct_bit(__FILE__, __LINE__, priv, addr, mask, timeout)
 353 #else
 354 #define iwl_poll_direct_bit _iwl_poll_direct_bit
 355 #endif
 356
 357 static inline u32 _iwl_read_prph(struct iwl_priv *priv, u32 reg)
 358 {
 359         _iwl_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
 360         rmb();
 361         return _iwl_read_direct32(priv, HBUS_TARG_PRPH_RDAT);
 362 }
 363 static inline u32 iwl_read_prph(struct iwl_priv *priv, u32 reg)
 364 {
 365         unsigned long reg_flags;
 366         u32 val;
 367
 368         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 369         iwl_grab_nic_access(priv);
 370         val = _iwl_read_prph(priv, reg);
 371         iwl_release_nic_access(priv);
 372         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 373         return val;
 374 }
 375
 376 static inline void _iwl_write_prph(struct iwl_priv *priv,
 377                                              u32 addr, u32 val)
 378 {
 379         _iwl_write_direct32(priv, HBUS_TARG_PRPH_WADDR,
 380                               ((addr & 0x0000FFFF) | (3 << 24)));
 381         wmb();
 382         _iwl_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val);
 383 }
 384
 385 static inline void iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
 386 {
 387         unsigned long reg_flags;
 388
 389         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 390         if (!iwl_grab_nic_access(priv)) {
 391                 _iwl_write_prph(priv, addr, val);
 392                 iwl_release_nic_access(priv);
 393         }
 394         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 395 }
 396
 397 #define _iwl_set_bits_prph(priv, reg, mask) \
 398         _iwl_write_prph(priv, reg, (_iwl_read_prph(priv, reg) | mask))
 399
 400 static inline void iwl_set_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
 401 {
 402         unsigned long reg_flags;
 403
 404         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 405         iwl_grab_nic_access(priv);
 406         _iwl_set_bits_prph(priv, reg, mask);
 407         iwl_release_nic_access(priv);
 408         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 409 }
 410
 411 #define _iwl_set_bits_mask_prph(priv, reg, bits, mask) \
 412         _iwl_write_prph(priv, reg, ((_iwl_read_prph(priv, reg) & mask) | bits))
 413
 414 static inline void iwl_set_bits_mask_prph(struct iwl_priv *priv, u32 reg,
 415                                 u32 bits, u32 mask)
 416 {
 417         unsigned long reg_flags;
 418
 419         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 420         iwl_grab_nic_access(priv);
 421         _iwl_set_bits_mask_prph(priv, reg, bits, mask);
 422         iwl_release_nic_access(priv);
 423         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 424 }
 425
 426 static inline void iwl_clear_bits_prph(struct iwl_priv
 427                                                  *priv, u32 reg, u32 mask)
 428 {
 429         unsigned long reg_flags;
 430         u32 val;
 431
 432         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 433         iwl_grab_nic_access(priv);
 434         val = _iwl_read_prph(priv, reg);
 435         _iwl_write_prph(priv, reg, (val & ~mask));
 436         iwl_release_nic_access(priv);
 437         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 438 }
 439
 440 static inline u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr)
 441 {
 442         unsigned long reg_flags;
 443         u32 value;
 444
 445         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 446         iwl_grab_nic_access(priv);
 447
 448         _iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr);
 449         rmb();
 450         value = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
 451
 452         iwl_release_nic_access(priv);
 453         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 454         return value;
 455 }
 456
 457 static inline void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
 458 {
 459         unsigned long reg_flags;
 460
 461         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 462         if (!iwl_grab_nic_access(priv)) {
 463                 _iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
 464                 wmb();
 465                 _iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, val);
 466                 iwl_release_nic_access(priv);
 467         }
 468         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 469 }
 470
 471 static inline void iwl_write_targ_mem_buf(struct iwl_priv *priv, u32 addr,
 472                                           u32 len, u32 *values)
 473 {
 474         unsigned long reg_flags;
 475
 476         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 477         if (!iwl_grab_nic_access(priv)) {
 478                 _iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
 479                 wmb();
 480                 for (; 0 < len; len -= sizeof(u32), values++)
 481                         _iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, *values);
 482
 483                 iwl_release_nic_access(priv);
 484         }
 485         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 486 }
 487 #endif